Alarm system.



PATENTED SEPT. 26, 1905.

F. MGGLOIN.

ALARM SYSTEM.

APPLICATION FILED DEG.31,1902.

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PATENTED SEPT. 26, 1905.-

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P. MOGLOIN- ALARM SYSTEM. APPLICATION FILED 13110.31, 1902.

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UNITED STATES PATENT oEEroE.

FELIX MCGLOIN, OF NEW YORK, N. Y., ASSIGNOR TO AUTOMATIC FIRE ALARM COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ALARM SYSTEM.

Specification of Letters Patent.

Patented Sept. 26, 1905.

To all whom it Wmy concern/.-

Be it known that I, FELIX MGGLOIN, a citizen of the United States, residing at New York, in the county of Kings, State of New York, have invented certain new and useful Improvements in Alarm Systems, of which the following is a full, clear, and exact description.

My invention relates to signal systems, and particularly to a system and apparatus for electrically sending an alarm or signal from a substation to a central station over a circuit so that it cannot be seriously interfered with.

The object of my invention is to provide a simple and eflicient apparatus and system for sending in an alarm or signal to acentral sta- I tion. The construction will be found to be such that alarms may be sent in which cannot be interfered with by the attempting to send in of an alarm from a station beyond the station which is in operation and yet which will not prevent the sending in of an alarm from a station nearer to the central station or inside on the line. In this latter case, however, the first station started is temporarily cut out while the alarm is being sent in from the inside station; but the apparatus at the first station is always ready to send in the remainder of its alarm as soon as the inside station has completed its operation.

The invention will be found to consist in the improvements hereinafter described and as embodied in the two sheets of drawings filed herewith. The main circuit of the system is normally energized and may be either a grounded circuit or an all wire circuit. Normally each substation instrument or signal-box is cut out from the system. The pulling of a substation signal-lever throws a switch which brings that instrument into operation and breaks the main circuit, so that if an instrument beyond is thrown into the circuit it will not receive any current until the first has completed its operation. If an instrument inside the first is thrown into the circuit while the first is in operation, the main circuit is thus deenergized beyond the one now in operation, so that the first instrument is temporarily deenergized, although ready to proceed with its operation as soon as the main circuit is returned to its normal condition by the cessation or completion of operation of the inside instrument.

In the drawings, Figure 1 represents diagrammatically a system embodying the improvements of my invention. Fig. 2 repre sents diagrammatically one form of switch adapted to operate in my system. Fig. 3 is an elevation, largely diagrammatic in character, of a box containing improvements of my invention adapted to be used in this system.

In the diagrammatic view, Fig. 1, A is the central station. B B B are line instruments or substation signal-boxes. O is a testing instrument adapted to be set in operation as will be hereinafter described. In the main circuit a is an operating-battery. a is a switch, and a isa testing-battery. Each substation instrument is provided with switches 6 6 I)", by means of which the instrument may be thrown into the circuit. A is that part of the main circuit which leads from the central station to the firstinstrument. Similarly, A A and A* designate the circuits leading from the central station to the instruments B B and O. The central station is grounded at D and the substations at D, D D and D*. Obviously instead of this ground the circuit might be completed by a metallic connection, so that there would be an all-wire circuit from the central station.

It will be noted on inspection of Fig. 1 that in its normal condition the circuit is energized throughout with only the testing instrument C in circuit. Each substation instrument is placedin a position so that it may be thrown across the two parts of the main circuit and take the entire current, so that no two instruments can be in circuit at the same time, the throwing in of one instrument breaking the main line at that point.

The operation of an individual instrument may be best understood from an inspection of Fig. 3. In this view, which is largely diagrammatic, I have shown a box having a post E, to which the central line-wire A of Fig. l is connected. To the binding-post F is connected the wire completing the circuit A to the instrument beyond, or, as I have called it, the line-wire. Or is a binding-post by which the instrument itself is connected to the ground or to the return circuit and which I have marked Return. When the instrument is in its normal condition and no alarm 18 being sent in, the circuit 18 from the central station to the binding-post E and out through the bindingq'iost F through the line, the testing instrument U, and the ground return. When the instrument is thrown into operation, as will be hereinafter described, the instrument itself is thrown into the circuit,which then passes from central to post E and out through the post ("fr to the return, the linewire from the post F being cut out;

The box may be provided with a suitable lightning-arrester H, call-bell I, and telegraph-key J for use as is common in this general class of instruments. Since, however, they are not involved in this invention, they will not be further referred to herein.

1 is the switch, corresponding to 7/ 6 &c., of Fig. 1, by means of which the signal-box or substation instrument may be thrown into circuit. This switch is connected at all times to the line-wire. The contacts 2 and 3 of this switch are connected, respectively, to the line and to the instrument. As shown in Fig. 3, the circuit passes from the post E through the switch 1, contact 2, and out through the line by way of the post F. W hen the switch 1 is moved onto the contact 3, the circuit passes from central to the post E, switch 1, contact 3, thence to the terminal 4-. of the make and break through the signalwheel, (see Fig. 3,) and from terminal 5 to the releasing-magnet coil 6, and to the re turn-post at G. At this time the instrument is in the main circuit, and the coil 6 being energized the pivoted armature 7 is drawn down and the flyescapement 8 thus released by the movement of the stop or detent 7.

The fly-escapement is actuated by means of a clock mechanism with a suitable drivingspring 91, which drives through the gears 9 10 and 12 and 13, 14 and 15, 16 and 17 to the escapement-gear 18. On the shaft with the gears 10 and 11 is mounted a notched disk or cam 19 with which the end 20 of the armature member 7 is adapted to engage. In the normal inert position the end 20 rests in the notch of the disk 19 and prevents the gear mechanism from revolving by permitting the stop or detent 7" to block the fly-escapement 8. When the armature 7 has been drawn down to the magnet by its being energized, the end 20 is removed from the notch and the escapement-fly 8 unblocked, permitting the clock mechanism to revolve in the directions indicated by the arrows.

Upon the same shaft with the disk 19 is mounted the signal wheel or disk 21, which is provided with a suitable number of notches or insulating portions, by means of which the desired signal may be sent in to the central station-as, for instance, the signal twentylive, indicated in Fig. 3 by the heavy black spots. A pair of spring-arms, as indicated at 22, are adapted to engage with this wheel and coact to send in the proper signal through the make'and-break device, whose terminals are 1 and 5, Fig. 3. When the instrument has once been energized by throwing the switch 1 onto contact 3, the mechanism of the instrument will continue to revolve and send in a series of alarms of a duration depending upon the ratio of the gears or the energy of the spring. \Vhen the spring is run down, the instrument will of course stop. This may also be accomplished by means of a stop. it will also be noticed that if at any time during the operation of the instrument the circuit becomes deenergized for any reason the armature 7 will be released. As soon, therefore, as the notch in the disk 19, which is now revolved. comes opposite the end 20 of the armature member the spring 23 will draw the armature mem her down, permitting the detent 7 to engage the escapement 8, and thus stop the mechanism. As soon as the circuit is again energized the armature 7 will be drawn down again, and the end 20 being freed from the notch the disk 19 will revolve as before until the clock mechanism runs down or is otherwise stopped.

It will be found on an inspection of Fig. 3 that I have. provided means for automatically stopping the rotation of the clock mechanism, and thus ceasing to send in a signal which in its operation is combined with the mechanism for starting the instrument or for throwing it into circuit. For this purpose I have provided a controlling device having the handle 24. This device has a shoulder 25, which is adapted to engage with one end of the switch 1 to throw the same when starting the instrument. The switch is held in its normal position by means of the helical spring 26. Similarly, the controller is held in its normal position by the spring 27. Vhcn the handle 24 is pulled down, the controller is rotated clockwise. the spring 91 is partially wound up, and the finger 28 is caught by means of the catch 29, carried by the lever 30. This lever 30 is normally held in the position shown in Fig. 3 by means of the spring 31, which presses against the outer left-hand surface. \Vhen the controller has been moved and caught by the lock 29, the switch 1 is held in position on contact 3. since the right-hand end 32 of the switch rests against the outer surface of the controller above the shoulder 25. Since the gear 3 1 is an exact multiple of the gear 11, when the mechanism has been revolved through the predetermined number of revolutions by means of the coiled "spring 91 the releasing-pin 33, carried by the gear 31, moving in the direction of the arrow, will strike the end of the locking-lever 30, and moving the same to the left will release the linger 28 and permit the controller to move back to its normal position under the influence of the spring 27. As the controller is moved back anticlockwise the end 32 of the switch 1 is permitted to slide into the recess back of the shoulder 25, and thus break the instrumentcircuit and restore the main circuit to its normal energized condition. The withdrawal of the switch 1 from the contact 3 opens the circuit through the magnet 6, deenergizing the same and permitting the projection 20 to be drawn into the notch of the cam 19 and the detent 7 to engage the fly-escapement 8, thus stopping the signal-wheel train. The projection 35 on the controller assists in bringing the switch 1 back to its normal position. 1 have provided the stop 36, which coacts with the handle 24 of the controller to limit its backward movement. It will thus be seen that the handle of the controller 24 can be pulled down but once, where it will remain until the instrument has sent in its required number of signals. Finger 28 will be then released and another alarm may be sent in, if necessary. The pulling down of the handle 24 also serves to wind up the coiled spring 91. For this purpose the handle 24 is provided with a pivoted pawl 37, which engages with the teeth of a ratchet 38. To this ratchet 38 is attached the inner end of the coiled spring 91. The other end of the spring is secured to the gear 9. The ratchet is held from backward movement as in an ordinary clock. If the detent 29 is held from engagement with the arm 28, the handle 24 can be moved up and down a number of times, thuslwinding up the spring 91 as much as desirec In Fig. 2 I have shown diagrammatically a mechanism much simplified and by means of which the principles and the operation of the instrument shown in Fig. 3 may be readily understood. This is modified to some extent; but its operation will be clear. The maincircuit wire passes to the center of the controller member K and out through the switcharm L to the contact 2 and the line. This is in its normal position. Then the handle K is pulled down, the switch-arm L is thrown onto contact 3 and the instrument thrown into circuit which is then broken at that point, so that no instrument beyond will receive any current until the switch L is returned to its normal position.

Since all the instruments in an alarm system are practically the same and since there is a greater amount of resistance in the main circuit for those instruments which are more remote from the central station than those which are nearer, I prefer to use resistance,

as indicated at R R with the instruments which shall compensate for the extra resist ance in the line beyond, so that each instrument when in operation shall operate on a circuit of practically the same resistance.

l/Vhen it is desired to test the main circuit to see if it is in the proper condition, the switch (f may be thrown from its usual contact, so as to bring into the circuit the battery (1 The additional current thus thrown into the circuit if the circuit is in its proper condition will be suflicient to cause the magnet 61 of the testing instrument C to draw its armature 71, and thus set a suitable clock mechanism in'operation to send in the testingsignal.

The sending in of an alarm or signal after the instrument has been putin circuit depends upon the condition of the circuit. The number of alarms to be sent in may be determined by the maker of the instrument at the beginning and depends upon the ratio of the gearing employed. The sending in of an alarm after the instrument has once started will be stopped temporarily by the deenergizing of the circuit and will be stopped automatically (so far as that particular alarm is concerned) as soon as the wheel 34 has revolved once. Considering these features, it will thus be seen on an inspection of Fig. 1 that if an instrument for instance, B is in circuit and operation the pulling down of the switch Zflwhich corresponds to switch 1) while it connects the instrument B with the main line does not start it, since there is no current flowing in the circuit and there will not be until all the instruments inside have ceased operation. If, on the other hand, while B is in operation the instrument B inside be thrown into circuit, the circuit A is denergized, and the instrument B will only continue to revolve without sending in an alarm, and even this revolution will continue only during that portion of a revolution of the disk 19 necessary to bring the notch opposite the end of the lever 20, at which time the instrument will stop its operation. It will, however, be in such a condition that as soon as the inside instrument B ceases operation it will automatically start and immediately send the remainder of the signal, beginning at the next signal after it was interrupted. The line A A A is therefore a combined signal and control line, since it acts to convey signals to a central station and to stop instruments already in operation whenever one nearer central is started and start them again whenever such intervening instrument has completed its signal. Inasmuch as each instrument is designed to send in a series of, say, five or six signals at one operation, no substantial or material interference will occur. The notch in the disk 19 should be in such a position that the ends of the make and break will rest on a conducting portion of the wheel 21 when the instrument is demagnetized.

What I claim is- 1. In a signal system, the combination of a source of electricity, a signal-transmitting circuit leading therefrom having a single conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting each signal device to its section, and means controlled by said signal-transmitting circuit for interrupting the mechanical operation of any operat- ITO ing signal device farther removed from the central station whenever an intermediate signal device is operated.

2. In a signal system, the combination of a source of electricity, at signal-transmitting circuit leading therefrom having a single conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting eachsignal device to its section and disconnecting more remote points from the source, and means for interrupting the mechanical operation of any operating signal device farther removed from the central station whenever an intermediate signal device is started and said operating device is disconnected from the source, and means for automatically starting said operation again when said intermediate device has completed its signal.

3. In a signal system, the combination of a source of electricity, a signal-transmittingcircuit leading therefrom having a single conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting each signal device to its section and means for temporarily interrupting the mechanical operation of any outside signal device then in operation so that its signal-disk shall be in a definite position.

4. In a signal system, the combination of a source of electricity, a signal-transmitting circuit leading therefrom having a single conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting each signal device to its section and means for temporarily interrupting the mechanical operation of any outside signal device then in operation so that its signal-disk shall be in a definite position and means for automatically putting said signal device again into operation when the firstmentioned device has completed its signal.

5. In a signal system, the combination of a source of electricity, a single signal-transmitting circuit leading therefrom, a plurality of signal devices adapted to be connected to said circuit, means for connecting each signal device to said circuit and means controlled by said circuit for interrupting the mechanical operation of all signal devices farther removed from the central station which have been previously started and preventing the subsequent starting of any more remote instrument until the first instrument completes its operation.

6. In a signal system, the combination of a source of electricity, a single signal-transmitting circuit leading therefrom, a plurality of signal devices adapted to be connected to said circuit, means for connecting each signal device to said circuit and means controlled by said circuit for interrupting the mechanical operation of all signal devices farther removed from the central. station, means for preventing a signal from more than one device starting at once and means for automatically acting upon each of said signal devices through said circuit so as to cause them respectively to separately send in their signals when the intervening signal devices have completed their operation.

7. In a signal device, the combination of a source of electricity, a combined signal and control single signal-transmitting circuit lead ing therefrom having a conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting each signal device to its section and disconnecting all outside sections from the source, and means for interrupting the mechanical operation of any operating signal device when it is thus disconnected.

8. In a signal device, the combination of a source of electricity, a combined signal and control circuit leading therefrom having a conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting each signal device to its section and disconnecting all outside sections from the source, and means for interrupting the mechanical operation of any operating signal device when it is thus disconnected, and means for automatically causing the renewed operation of said interrupted devices when their connections with the source are reestablished.

9. In a signal device, the combination of a source of electricity, a combined signal and control circuit leading therefrom having a conductor made up of detachable sections, a signal device for each section normally detached therefrom, means for connecting each signal device to its section and disconnecting all outside sections from the source, and means for interrupting the mechanical operation of any operating signal device when it is thus disconnected, and means for automatically causing the renewed operation of said interrupted devices when their connections with the source are reestablished, and means for automatically reestablishing said connections when the intervening signal devices have completed their operations.

10. In a signal system, the combination of a source of electricity, a signal-transmitting line leading from one terminal thereof, a plurality of signal devices each having spring-actuated signal-disks and having one terminal connected to the second terminal of said source, each device having means for connecting its other terminal to the said signal-transmitting line and interrupting said line just beyond such device, and an electromagnet adapted to release said disk by the connection of said device to said source through said signal-transmitting line.

11. In a signal system, the combination of a source of electricity, a signaltransmitting line leading from one terminal thereof, a plurality of signal devices each having spring-actuated signal-disks and having one terminal connected to the second terminal of said source, each device having means for connecting its other terminal to the said signal-transmitting line and interrupting said line just beyond such device, and an electromagnet adapted to release said disk by the connection of said device to said source through said signaltransmitting line, and means for causing said disk to stop between two signals when the connection with the source is broken.

12. In asignal system, the combination of a source of electricity, a signal-transmitting line leading from one terminal thereof, a plurality of signal devices each having spring-actuated signal-disks and having one terminal connected to the second terminal of said source, each device having means for connecting its other terminal to the signal-transmitting line and interrupting said line just beyond such device, and an electromagnet adapted to release said disk by the connection of said device to said source through said signal-transmitting line, and means for causing said disk to stop between two signals when a predetermined number of signals has been sent.

13. In a signal device, the combination of a source of electricity, a signal-transmitting line leading from one terminal thereof, a plurality of signal devices each having spring-actuated signal-disks and having one terminal connected to the second terminal of said source, each device having means for connecting its other terminal to the signal-transmitting line and interrupting said line just beyond said device, a cam-surface and train moving with said disk, an electromagnet having an armature acting to release said train when energized and blocking said train at a point determined by said cam when the magnet is deenergized.

14. In a signal system, the combination of a source of electricity, a signal-transmitting line leading from one terminal thereof, a plurality of signal devices each having spring-actuated signal devices and having one terminal connected to the second terminal of said source, each device having means for connecting its other terminal to the signal-transmitting line and interrupting said line just beyond said device, a cam-surface and train moving with said disk, an electromagnet having an armature acting to release said train when energized and blocking said train when the magnet is deenergized, said cam acting to prevent such blocking at any time except when the signal-disk is in a certain position.

15. In a signal system, the combination of a source of electricity, a signal-transmitting line leading therefrom and made up of sections adapted to be connected and disconnected, a plurality of electric signal devices, one for each section, each device having means controlled through said line for automatically stopping its mechanical movement whenever a device nearer the source is subsequently put into operation irrespective of the signal-number.

16. In a signal system, the combination of a source of electricity, a signal-transmitting line leading therefrom and made up of sections adapted to be connected and disconnected, a plurality of electric signal devices, one for each section, each device having means controlled through said line for automatically stopping its mechanical movement whenever a device nearer the source is put into operation irrespective of the signal-number, and means for automatically putting said firstmentioned device into operation again when the intervening device has completed its operation.

17. In asignal system, the combination of a source of electricity, a signal-transmitting line leading therefrom, said line being made up of sections adapted to be connected and disconnected, a plurality of electric signal devices adapted to be connected to and disconnected from said line, each having electromagnetic means for putting it into mechanical operation whenever connected to said source through said line and means for interrupting its mechanical operation whenever such connection is interrupted and means for interrupting said connection whenever the signal device nearer the source is subsequently put into operation irrespective of the signal-number.

18. In a signal system, the combination of a source of electricity, a signal-transmitting line leading therefrom, said line being made up of sections adapted to be connected or disconnected, a plurality of electric signal devices adapted to be connected to and disconnected from said line, each having electromagnetic means for putting it into mechanical operation whenever connected to said source through said line and means for interrupting its mechanical operation whenever such connection is interrupted and means for interrupting said connection whenever a signal device nearer the source is subsequently put into operation irrespective of the signal-number, and means for automatically renewing the operation of said first-mentioned device when its connection with the source is reestablished.

19. In a signal system, the combination of a source of electricity, a signal-transmitting line leading therefrom, said line being made up of sections adapted to be connected or disconnected, a plurality of electric signal devices adapted to be connected to and disconnected from said line, each having electromagnetic means for putting it into mechanical operation whenever connected to said source through said line and means for interrupting its mechanical operation whenever such connection is interrupted, and means for interrupting said connection whenever a signal device nearer the source is subsequently put into operation irrespective of the signal-number, and means for automatically renewing the operation of said first-mentioned device when its connection with the source is reestablished, and means for automatically reestablishing said connection when said intervening signal device has completed its operation.

20. In a signal device, the combination of a switch normally joining two sections of line and adapted to connect and disconnect said device with a source of electricity and simultaneously break or make the line connections at the device, a detent acting to hold said switch in connecting position and means for releasing said detent at the end of a given number of signals permitting said switch to return to its normal position.

21. Ina signal device, the combination of a switch adapted to connect said device with a source of electricity and simultaneously break or make the line connections at the device and disconnect from said source all devices beyond said first-mentioned device, a cam for actuating said switch, a handle for actuating said cam, a detent for holding said cam in switch-actuating position and means for withdrawing said detent and permitting the cam and switch to return to their normal position at the end of a given number of signals.

22. In a signal device, a central terminal, a line-terminal, a return-terminal, the combination of a signal-disk making a plurality of revolutions when actuated, an electromagnet, a detent actuated thereby tending to stop said disk when the magnet is deenergized and releasing it when the magnet is energized and means for connecting said magnet to the central terminal until the signal-disk has made a predetermined number of revolutions and then automatically breaking such connection.

23. In a signal device, the combination of a signal-disk having insulated parts corresponding to the signal sent, two contacts connected respectively to the terminals of said device and bearing upon said disk and insulated parts, an electromagnet in series with the said contacts acting when energized to release said disk, a cam moving with said disk, a detent acting subject to said cam to stop said disk at a definite point corresponding to an interval between two complete signals, when the magnet is deenergized, at a point such that said contacts are in engagement with a conducting portion of said disk.

24;. In a signal device in combination, a switch, means for actuating said switch, a spring adapted to be wound by said means, a train actuated by said spring, a signal-disk driven by said train, a spring-controlled catch for holding said switch and actuating mechanism, a cam acting on said catch to release it after a definite movement of said disk has taken place.

25. In a signal device in combination, a switch, means for actuating said switch, a

spring adapted to be wound by said means, a train actuated by said spring, a signal-disk driven by said train, a spring-controlled catch for holding said switch in actuated position, a cam acting on said catch to release it after a definite movement of said disk has taken place, a detent adapted to be brought into engagement with said train when the catch is released.

26. In a signal device, a signal disk, a spring-operated train, an electroi'nagnet controlling said train, two contacts connected respectively to the terminals of said device and in series with said electromagnet, said disk normally electrically connecting said contacts, means for winding said spring and energizing said magnet, means actuated by the said magnet when energized for releasing said train and means for automatically stopping said disk at a point at which said contacts are electrically connected after a definite movement of said train has taken place.

27. In a signal device, a signal disk, a spring-operated train, an electron'iagnet controlling said train, two contacts connected respectively to the terminals of said device and in series with said electromagnct, said disk normally electrically connectingsaid contacts, means for windingsaid spring, means actuated by the said magnet when energized for re leasing said train and means for automatically stopping said disk after a definite movement thereof at a point at which said contacts are electrically connected, a switch for disconnecting from the source devices further beyond said first-mentioned device and connecting said device to the main line so as to energize said magnet, means for holding said switch in said position and means for automatically releasing it so to cause it to disconnect said first-mentioned device and make connections for points further beyond. when a definite mechanical movement has taken place.

28. In a signal system, the combination of a source of electricity, a signal-transmitting line connected thereto and made up of sections A A A, a plurality of signal devices each having a switch 1 for connecting it to said line and for disconnecting all more remote portions of said line from the source, a train, a signal-disk 21 driven thereby, a cam 19, a lever engaging therewith and controlling said train and an electromagnet 6 controlling said lever when connected to the source through said switch.

29. In a signal system, the combination of a source of electricity, a signal-transmitting line connected thereto and made up of sections A A A, a plurality of signal devices each having a switch 1 for connecting it to said line and for disconnecting all more remote portions of said line from the source, a train, a signal-disk 21 driven thereby, a cam 19, a lever engaging therewith and controlling said train and an electromagnet 6 controlling said lever when connected to the source through said switch and means for manually operating said switch so as to connect the signal device to the line and means for automatically operating said switch so as to disconnect said signal device after a definite movement of said train.

30. In a signal device the combination of central, line and return terminals,a switch normally connecting said central and line terminals, a normally deenergized instrument-circuit connected to said return-terminal and having a contact adjacent said switch, said circuit being normally complete from said return-terminal to said contact, an electromagnetic device in said circuit, a signal-wheel in said circuit, a train for actuating said wheel, means for operating said switch to disconnect said central terminal from said line-terminal and to substitute the contact of said instrument-circuit, means controlled by said electromagnetic device for stopping said wheel whenever said instrument-circuit is deenergized, automatic means for returning said switch after a plurality of rotations of said signalwheel to restore the connection between said line and central terminals and disconnect said instrument-circuit.

31. In a signal device the combination of central, line and return terminals, a switch normally connecting said central and line terminals, a normally deenergized instrument-circuit connected to said return-terminal and having a contact adjacent said switch, said circuit being normally complete from said return-terminal to said contact, an electromagnetic; device in said circuit, a signal-wheel in said circuit, a train for actuating said wheel, means for operating said switch to disconnect said central terminal from said line-terminal and to substitute the contact of said instrument-circuit, means controlled by said electromagnetic device for stopping said wheel whenever said instrument-circuit is deenergized, automatic means for returning said switch after aplurality of rotations of said signal-wheel to restore the connection between said line and central terminals and disconnect said instrument-circuit, and means for automatically stopping said train at such time.

FELIX MGGLOIN.

l/Vitnesses:

Rom. S. ALLYN, L. VREELAND. 

